Photos taken within the AllTrails app and saved to the photo roll will be saved without latitude/longitude EXIF info because of a restriction built into iOS. However, we associate the latitude/longitude of the phone, at the time the photo is taken, as part of the AllTrails activity file. When the photo is synced back to AllTrails, you will see a latitude/longitude for it.
Photos taken outside the AllTrails app will have normal EXIF data, which will be read when you add the photo to an activity on your phone or upload the photo to https://www.alltrails.com on the web. Photos taken inside the AllTrails app, and then uploaded on the website will NOT have latitude/longitude info because the files do not have EXIF data, and they are not associated with the info from the activity.
NOTE: When adding photos that were taken outside the AllTrails app to the website or app, the photos must be in JPEG format in order to contain latitude/longitude data.